Here is one of my latest projects that involved repurposing some old junk into something useful. A go cart for my daughter! 
It's mostly made of old 2" x 2" signposts, a old Honda Harmony riding mower 5 speed transaxle and a Craftsman Eager 1 push mower engine. first gear is about 2 MPH and top end is about 5 - 6 MPH.
Grandpa, Mom and daughter cruising the hay fields at 2 MPH.

About time everyone got off so I can open er' up and do some serious driving.

How rude. Grandpa did you just see that cat cut me off? Well here's some fingers for you to think about kitty.

I tell ya a girl gets her first car and everyone and their mouse starts bumming rides.

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